// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_TOOLS_QUIC_QUIC_PACKET_WRITER_WRAPPER_H_
#define NET_TOOLS_QUIC_QUIC_PACKET_WRITER_WRAPPER_H_

#include <stddef.h>

#include <memory>

#include "base/macros.h"
#include "net/quic/quic_packet_writer.h"

namespace net {

// Wraps a writer object to allow dynamically extending functionality. Use
// cases: replace writer while dispatcher and connections hold on to the
// wrapper; mix in monitoring; mix in mocks in unit tests.
class QuicPacketWriterWrapper : public QuicPacketWriter {
public:
    QuicPacketWriterWrapper();
    explicit QuicPacketWriterWrapper(QuicPacketWriter* writer);
    ~QuicPacketWriterWrapper() override;

    // Default implementation of the QuicPacketWriter interface. Passes everything
    // to |writer_|.
    WriteResult WritePacket(const char* buffer,
        size_t buf_len,
        const IPAddress& self_address,
        const IPEndPoint& peer_address,
        PerPacketOptions* options) override;
    bool IsWriteBlockedDataBuffered() const override;
    bool IsWriteBlocked() const override;
    void SetWritable() override;
    QuicByteCount GetMaxPacketSize(const IPEndPoint& peer_address) const override;

    // Takes ownership of |writer|.
    void set_writer(QuicPacketWriter* writer);

private:
    std::unique_ptr<QuicPacketWriter> writer_;

    DISALLOW_COPY_AND_ASSIGN(QuicPacketWriterWrapper);
};

} // namespace net

#endif // NET_TOOLS_QUIC_QUIC_PACKET_WRITER_WRAPPER_H_
